Allah’s Laws govern the universe and all of creation praises Him.

The seven heavens and the Earth and all that is therein glorify Him, and there is not a thing but celebrates His praise, but you do not understand their praise. (Quran 17:44)

Humans are born with an in-built, yet corruptible knowledge of Allah.

"Every child is born with an innate disposition (fitrah), but his parents turn him into a Jew or Christian (and other than that). It is like when an animal gives birth to normal offspring; have you noticed any (young animal) born branded (mutilated with the mark of its owners) before they are branded?" (Hadith)

Humans instinctively turn to Allah in times of need.

And when a calamity touches man, he calls to his Lord, turning repentant to Him. Then, when He grants him a favor from Himself, he forgets that for which he called to Him before, and sets up partners as rivals to Allah. (Quran 39:8)

Allah, our Maker, knows best how we can function properly.

Verily, We have created man out of drops of mixed sexual discharge, in order to try him: so We made him to hear and to see. Verily, We showed him the way, whether he be grateful or ungrateful. (Quran 76:2-3)